Quote Originally Posted by ecoli-557 View Post
I have what I suspect is a simple error on my part - but I can not seem to see it (trees?)
One error...no code shown...

It is working at 40 MHz - should I try a slower speed?
Have you tried? If you're using 40Mhz, chances are that you're using the internal PLL. Changing to 10Mhz would be a simple 4xPLL bit change... By definition, it would be slower.